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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69454300d75df413b1030b3e379f76de5c0a7d8f71ee77486d9646e923b4b850' 
  AND token = 'SXwrMfTfxbZys+o7YZl2UiHtCi0viETqCHNsg+1e8wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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