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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0c241fde69e576b6a27fa151b9dbcf0431b18f8e9ac3920b42b3741d8282a9' 
  AND token = 't/29jd7FVD9uljlA7ZXHF7vp0ex6dngMNEaidc9/fiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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