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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33aff1e5f93b36dfc85aa3d67966f3fd1d74316df00db743888d28e2f5efcaa9' 
  AND token = 'oKJiVBFzAq2tqFVYEmsyyD3Q4DODXv04tFhlIN76msw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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