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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49bf78d1e668f94f080ac8b2f798355e904d544f332f1c26945172549e2fe2bc' 
  AND token = '95VVn5yi8udnRFjBl3Vlo55+fGgq84PwB3eZmZiVrm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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