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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6178a56de7617e03f46126eebc20556ffc56ce294bb078112b6c4620495dbc' 
  AND token = 'VqCNMR358Ayam3pFh5tOt+i6SuAR3WjfUoDoZKMpI9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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