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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fd0e2e9bdc5fea0d8dc0eb4baa70cb66024048e4ec22e9f39251db452ea92c' 
  AND token = '9MDHRUlsMEiecfVNXAP18FzFQgxhlnEMnNbUnP9b4uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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