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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203fbfae27e123adaadef7a49b9f3289b726a600562f006a4d99c14c3464d63f' 
  AND token = 'fFYDZeStrXXFrMjgew8IdTabXbz7VafD2kTgB3hoZVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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