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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38083d047240fdf29f1ae27e1a6bf360ce866216bc66d0d30d4a7a9c52abc6f1' 
  AND token = '3WHRF5kjRDhkZm/uY8bZ0FRjRLvx4xMRtzPa9OGQPls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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