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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd8a15260aeb9e635e663f465dbf81c1acc81895219ce5fca202222a276be3c' 
  AND token = 'p2XHsIJSxH6UQ8l+RiDNZ5Aqv77pVv1PHQuC2A1kjwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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