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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f791a9938a393fd286ca2b40d56970e10ca5949a8e00a1dcfc406673c981d44' 
  AND token = '0EGSvQM5N9j9sRE3DYnOvej0ozhM6MfnRYOROk++GyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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