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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bec0b5a374e836b80e0de55caab421116dda30ac86ebf83e6f4755f6f240668' 
  AND token = 'uVRA5fJUjzETVY2FuHx1NRV+UWOz+iUhU1+9oExmADE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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