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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b6d155eafe898ea2f86b5013c7be2b15698b8cf5cc2a8129e2db7756ee8818' 
  AND token = 'Ntw1qztJ8sveWD0ImgwUcayzOD9wD4vwOGMaj0H2mMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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