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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2236d2a30b77b4b108cbb1a22b9575a950584d0201838e0650c93675fe8ddf70' 
  AND token = 'ayGacFNW3EDj/9Eo2M5mQpRJY7jh60gdoiLevu3X01Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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