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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0091006497b01a1bb06db99c763a019f0a8fedd9f8cee7754e3ef4621fc397f8' 
  AND token = 'QNd9X0VzccCGvoB2srELUYhewbGCM3FWNRNHFcanIzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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