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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3610ebfa49ca3f5d38e4cb0e75925dc5a89b29e7b6d533f02aaab9c06cf0ed' 
  AND token = 'PD84VbkueuW9n+vCTK0BCL+LgD+uHVEZcu2tikBpwVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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