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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d40b9ec257d7425f9a0a891aaf22a491a95e0a43c75729efbc547c3907d17d' 
  AND token = 'GgM3NH8UY69iR1ccYrv3M9WddgM09cl28++KLZxDXqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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