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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1fdbda661835851d20e3b72b71235dfd0ed3ab0cf8aa97a090a084bc9a160b' 
  AND token = 'r0gF4ijUXPmfXMm5GGD8J8UB4QgGJxpp3oXKMXBLx+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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