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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0a99964b93420922f14b462972b6ae206933f3e62e3843e4d29efb88004443' 
  AND token = 'sIlx4JBy5szroqJoYz7olzQ038XGP9CB3563i7XS0tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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