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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1bf83c0a27072a018383ab9a9859af993670ef5daada54c013b64dfc78b603' 
  AND token = 'chNzXiM6zDC/HIUh2bPam7wrT+usFPZUU3yJSFpWizU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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