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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7374a81a552fda9cec57af133307580652c798bfe742f801a425532a3accea37' 
  AND token = 'uydjGUxTwwH+BgA6yrsigPg0VoPl0WeruQpzRb7V2H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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