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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceae86324cf0438630e4fd9f8f1ccd171e61f78fa8d3a48dd3f1947a68b3b348' 
  AND token = '3YBY0cUQK44zAKWjCNCSGpDtFQdwu4QrIQr3+jIE/ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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