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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1085667f56ba0df5552ac8b4bfbdc08009edc7b83f9ae301525557dc07825566' 
  AND token = 'yLaSOQzahErMUukNE/sO1RxYQ7+Q9wJyoM9XhsFf/VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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