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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb00d1bf2798321bcfe2232b8d6cae378c74d70f1f84465b6c13ffd48f6c979' 
  AND token = 'BWZztc1I0m0TNpElZtnB5nx8Qork7ikFvBHEB0liigc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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