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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4844bda9809e25df20fb5995c90e944aa929b314c96caee5fd8d9c8e7d33a62f' 
  AND token = 'a77BMDRF1H411iQvam7jKuDa3Ib5EUoj9dvp4+E73Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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