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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7ccca850b6903cc4ca9f6a19f031c56fab4ecd5e1c36c03d5089aa17c7c583' 
  AND token = 'KsUetUl7x3I6ngbbMhgx5hdqzBYJ4rF3a2nH4bB1OP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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