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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e8a4bf54e852079d54add1392e41f859fab43146daf8e3b8cdc855c778e827' 
  AND token = 'd5zsM19CArvIFz4T5ZH7SXhYIeOXwRbgT09nNTN+I90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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