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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc994e841e3986e1b84693d6b4b8de5c10754ff96099de4d1e1482e3a1763762' 
  AND token = 'P6rTtF8EdQUUHQ+Ff93skERwa94DWtnJlHUMK6f+JRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}