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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e8173c60c842755b28ed7f7d11e81573745ca9dd4e2da60b248c31d92fecff' 
  AND token = '89vWRJvqFvJqcC6hCR6iounwx1hRg2pb8grnpuxj1cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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