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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6713fc4b6481449d51721f4fb2842ec70b5c87c558f0f368e2bd0ed2054ba136' 
  AND token = 'Gh/nAVB2X9kiNGSKZB6eT2obO4nWJMNT+9pSB/ZcaCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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