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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d19548c461117968352a1d8c54d7d34b7b84eb4c2c6a35cd7d956300e0f3300' 
  AND token = 'ACk5Cb7NA95Pqf5pi7HR/sCl7pMvc5FhTYb7QQhqt10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.02166

JSON explain

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