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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8473e32f5d7cc05a106d6fc9be96ced5cc898b98045c148d9ad743efa8fe47d' 
  AND token = 'l5miEmQHH8LU5P4gGUO/Fk1BUvafhbLv0vG/9U+yOX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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