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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d4c40751dbddb2dc5840a8de382995db05e6b261842a1ac2d948b03c7e5e7b' 
  AND token = '9ZfWVY0MyzlnCRla4EgNL8vYimCEoeDBTSQMf08ITpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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