SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101f227f263eff7bfe09cd708d5352d17ac48a93a2e73c09c2e178908cd9d487' 
  AND token = 'G0xVoukjw/vpu/KQHfqQtzoQmP8724HhJP0dBcONdag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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