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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30841093583a3b5cac58b184dc7c7e09706eb5ae9822e7122a71eccd6a7b093' 
  AND token = '7/T5DLf8a5824WXc2VZfDOvmnzSZ1AvmrZuLthqAYWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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