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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfb94c5a7442272fcb526c90e61a6077dc03eae33f51572ab879bb9bf82811c' 
  AND token = 'XX0i0ZHRdkg2sqbQam3txFzs18kfm6+is0Z+99jTX5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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