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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a094b35f6adadf3b11dfd2efffa95b909719b4c795104e0852c2ca4bb33338fd' 
  AND token = 'ntecGoGS22OqTlx/exPbN3Y1WXLw8RmxZUsG7WKSsjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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