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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329fd3dba55db1ea7f5535f705cb4845b6ee3919445563955c0c3f6f06e92b02' 
  AND token = 'opzBjN9wbhe9/RJNnlvN5uH9azSeYN8pe7tkuSZRZHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00382

JSON explain

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