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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5ae70e6df31bfa7d829bfaba7f4aea6c8762429eeb7a1a1c008e55dd27fb13' 
  AND token = '76YEy8jxTyeg8+DJ3HsLl3AktnGXWFlWazPTg2vFHyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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