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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0929d1f9845d714ea89f4d986abbdf1df06e9c0a3da6a5c19bfda5029b602bc6' 
  AND token = 'qQh/uviP4zNN122M2ILWAOCO342KzVTCrF/HCw+i5Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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