SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9aac2ae173fbd46af43be689d22a3c546d697f57886b086423d04c5120340f' 
  AND token = 'ThnE1O+Yf+4hgrJtVRPoLtxpqCIHkSDoxjK1GTA8lkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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