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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b503c1c192ba2ad9f80901a68c1e5b49d79b23eafe404690ae2e39c6199a965f' 
  AND token = 'AOJ9y7wtrLNWHgs4Zb+ImL1GuUl3yrR0FbQKtoM7ct8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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