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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e8925776192e0fc95417081363dc17fe959e976d00498cf5e0b377f6170f64' 
  AND token = '2J9Sbjap2NHg4/8p7SvySfg5gyfQdM9ZGqfBaGNF+kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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