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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8f6d1c145433625686f8d69c71f218a369ba9878fa5c51f30c3f70c95dc262' 
  AND token = 'H91DO6d1RqH0BgoJD5nClOkw6l9uGHeWPnSrbGcmdas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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