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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054b01d0da4aa78299fbb37c27077136d67e190e1b6b5f5ec82be8d22e7fdb16' 
  AND token = 'XPwx3WOoih/XVWoflAie4oMms5RC77X3ddFRixwB/+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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