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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ebb6e5ddc66c71053ea33ee4481e095e5386ab5716cdfe0e350cc0677df81d' 
  AND token = 'O+PlQWYqzaTLTr+0DH8MN7WJ5POB3/Jy8FsDodSNeKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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