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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbab927a32cc4e38a43ceafa1066f96a70882a286de57f0cfd6e921a35e52d8' 
  AND token = 'DuJ0NYYAwk7QVc3ikCw4k4uEYSk6AUr/GM4sNLM1qJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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