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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4960039c58b905d24ae24a5bf7535f6dc801ff529400a2562eba2a765f73a83a' 
  AND token = 'N5IjcCTpmEcSKii88LBz+kfFc0pZB18M/IKV6WNrZnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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