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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e90ad330375823c919a53bdac8eca93b7c0a13066b6ae4d8f28a1e52d9c533' 
  AND token = '9InU3bDu/JKCCsnzlXJfBw4T6J9OUZ3Ti+aCu5DY4V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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