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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8bdc9023f594107a8bcab3ebf09bdc1a436d2252ddf5d56e6f802401de977a' 
  AND token = '0uiOpUlhU01vKKrA8Vf0sTFG671+vPtHb3jLei5e4Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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