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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1624b2233fcf6f827beec8bddfe852be25c61502b253c2983d1920a133d5a208' 
  AND token = 'Rva7+eIqwPmGIDzQl41TBEBq0KbGIOwDs/f7eRNYXus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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