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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b1e0681055a531981b57e7a15de60c69064fc89b5c6b9cbbaf693bf84ec0a73' 
  AND token = 'm78yfy3rG3LVO6S8h6xFsPiIfVcS3suX+xjLkOcbWzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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