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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03835d6468221ee5e8e4fb3487835502ba969dfee8509c3ac46e0bae48cb161d' 
  AND token = 'VuA7v6ZAzYX9nxDur7/O4a4Dv2geJYTiEHke4QOEZSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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