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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ec232ccc20ffdf2c129ff46cdf418c1458926050a526fb7e6678e5117252f3' 
  AND token = 'knphBNL0QF0InbOKQBC6bCrXzSmovjUlg6PJMtT3eBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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