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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96564046a9cc1a1d70088f14e3593bf7b32d314219567af665b5c81980990178' 
  AND token = '8TcSGDMF5swRvjnxcQiO+zZapaM+7kxn7AWysS/Zztw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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