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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5a3b5484d7058c6e14322d6cb13848bcb02f491ce84c1b1a51a718f198258f' 
  AND token = 'uU6cc1HpxUnXLREU2GEFaeK7UNon5LK466tRjBr1lg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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