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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c271380f839b94fc52ce56eb5fb92c223a0e54b7bd24905e8c8a1553380a6ae4' 
  AND token = 'SAalQ7tqX5zCqkJVjR/LyW8Sq6Led8OWD54m4i5x1Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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