SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faea174054cae79c83a9ec26ba7d6721b3b337eedb9277d0e81bb4ea4aff52f2' 
  AND token = '+jEylvFrZD2+FvcrpCYZ3WnfOpwLZyZjFqBqDl/tBmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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