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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c326a9b1b08abd8b60e824c4bead9ef20f9dc6a67a14bacd5e493a3066b23ecd' 
  AND token = 'qHgjlcC/fBQhm5VQiRxc53HGV5tGRfmpDFQVgmCjAas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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