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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0823105e64d2f931748a4cd98672690019bde7f5938b8f1c6c43906fae337671' 
  AND token = 'zG77qRZOwTm1y5BIBNqL5p3wwPru1SpJCp5i4Bln4yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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