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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c18f92bcd4f364d5345bf087194b98c8351ba34dfe3bbc33e0c84e5e0827c8cd' 
  AND token = 'LctcupOQffkZIW6zMU04p+KB4IjPKv1BO1W9t4Tjxag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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