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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed3923b2503bf93e94d7f25f66e68e34efc2934e8ec63fcb49f16001aa428dd' 
  AND token = 'VEX5Kfqp0jMzX1sr/85g3qJq2oN4CtK5N4za8KFpoxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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