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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acf28ea72eb5d502c2ec6d5191edeece94c270a4f9ddc933a908ea976b374b2' 
  AND token = '7kHDM64UjC+73/HpY9UygBSUsxCWPXeGh6kfczpjy9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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