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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bd08cb7bd235937c63e4450aa69b594ff93deffc739b0c9cb90b2ec89c4fce' 
  AND token = '2sHjVdJDS3iCAmzk6o7Z5jSeL7jkmuet1nkOTsBXj/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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