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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f45a8acafdaec758b9cc89dac52456342058b0693f8c012aad34f8fd3a8e0c' 
  AND token = '1bnMiT4RGuhHNePTtwT12aBlCXYAy5cVCt2iKtyfW60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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