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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e173e5a8ee736355bbc12f7f65eebb74f537d64820de9d2e3ef2b0addcf96e' 
  AND token = 'jYb8yZQ6LKfUkcsAipeh/QbGdhIznhXicSII6UY8D9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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