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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139619c83a894f970d7c6b262d4ce24db30152f24fc70d7fbb9ec512117de942' 
  AND token = 'It0+P/pHD2QFvQW5EQ4JsRQdc7Lt7UFzSWRVbshoVCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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