SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676c801ab2fcceb7683f66a6816796436d9d9b476f2f1b09dce9f982902b18bb' 
  AND token = 'lcg9Lb/nBDhkvUVRsYsJoi1hX6qZGjQYPH25N38YFGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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