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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d117506a56c05aac8cf332d6ad97658c1b9498b1086e2046765bc9f809f9f8' 
  AND token = '43mUvqTfcK6DwQCT8OfuA8RhMvC5I8/2Dgi7CUFe2eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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