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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a62dc31e289aad4bf6c4ebaad1c84a666f1f94717fb28de0283f9cd14aee8f' 
  AND token = 'Aa/LLlDxsxfli+EEjEbkYvUiLcH39Mv5n90aFLileuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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