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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0937838f411264b9d1ee1fc0f95bcc3f3686b43edc423c732ce07b11b1ec0ed' 
  AND token = 'a3BXaJFbeYfut6fLAjW4CpOBtfgk8CD5P/bNZ4FK3Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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