Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f349f00b92bdad2f6dcde9b5a25e5bf0c0215293ca6cba2369190a194e0519' 
  AND token = 'kSafG7THWonw5jl6GaRfDyezSwWTUCAnfddeZWGgmAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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