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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d51bdeecf3f1e8ed9a274dfc4d78fc2f8a824f75960f64f12174ce4ac7b21f' 
  AND token = 'q8i4DUDDMcAod235pR9pcKGywHg3O2g39/BPxT67UZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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